Fourthly, I wish to refer all who are interested in the topics discussed
in my address on "Geological Reform," to the reply with which Sir
William Thomson has honoured me.

And, lastly, let me say that I reprint the review of "The Origin of
Species" simply because it has been cited as mine by a late President of
the Geological Society. If you find its phraseology, in some places, to
be more vigorous than seems needful, recollect that it was written in
the heat of our first battles over the Novum Organon of biology; that we
were all ten years younger in those days; and last, but not least, that
it was not published until it had been submitted to the revision of a
friend for whose judgment I had then, as I have now, the greatest
respect.

Ever, my dear TYNDALL,

Yours very faithfully,

T.H. HUXLEY

LONDON, _June 1870_.




CONTENTS.


I.